Jump to content


Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse
 

Photo
- - - - -

First to Fifteen


Best Answer CaptainEd, 30 January 2013 - 05:06 PM

Spoiler for I would like to draw a good picture
Go to the full post


  • Please log in to reply
19 replies to this topic

#11 Prime

Prime

    Senior Member

  • Members
  • PipPipPipPip
  • 872 posts
  • Gender:Male
  • Location:Illinois, US

Posted 29 January 2013 - 06:26 PM

Nine white poker chips have the numbers 1, 2, 3, ..., 8, 9 written on them, one number on each chip. You and a friend alternately select a chip, with the aim of being the first to draw three numbers that sum to 15. You may play first or second. Do you have a winning strategy?

 

 

Here's a winning strategy

Spoiler for

In this example, doesn't 2nd player win on his 3rd move having (2,7,6)?


Edited by Prime, 29 January 2013 - 06:27 PM.

  • 0

Past prime, actually.


#12 bushindo

bushindo

    Senior Member

  • VIP
  • PipPipPipPip
  • 721 posts
  • Gender:Male
  • Location:Los Angeles, CA

Posted 29 January 2013 - 06:28 PM

 

Nine white poker chips have the numbers 1, 2, 3, ..., 8, 9 written on them, one number on each chip. You and a friend alternately select a chip, with the aim of being the first to draw three numbers that sum to 15. You may play first or second. Do you have a winning strategy?

 

 

Here's a winning strategy

Spoiler for

In this example, doesn't 2nd player win on his 3rd move having (2,7,6)?

 

Shucks, back to the drawing board.


  • 0

#13 CaptainEd

CaptainEd

    Senior Member

  • Members
  • PipPipPipPip
  • 1094 posts

Posted 29 January 2013 - 10:05 PM

Yes, now you guys have made it pretty clear

Spoiler for Funny 3-D tic tac toe


  • 0

#14 Prime

Prime

    Senior Member

  • Members
  • PipPipPipPip
  • 872 posts
  • Gender:Male
  • Location:Illinois, US

Posted 29 January 2013 - 10:11 PM

Spoiler for Not an answer


  • 0

Past prime, actually.


#15 bonanova

bonanova

    bonanova

  • Moderator
  • PipPipPipPip
  • 5840 posts
  • Gender:Male
  • Location:New York

Posted 30 January 2013 - 04:07 PM

Yes, now you guys have made it pretty clear

Spoiler for Funny 3-D tic tac toe


This is correct.

Can you draw a picture? :)
  • 0
The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#16 CaptainEd

CaptainEd

    Senior Member

  • Members
  • PipPipPipPip
  • 1094 posts

Posted 30 January 2013 - 05:06 PM   Best Answer

Spoiler for I would like to draw a good picture

Edited by bonanova, 30 January 2013 - 05:16 PM.

  • 1

#17 bonanova

bonanova

    bonanova

  • Moderator
  • PipPipPipPip
  • 5840 posts
  • Gender:Male
  • Location:New York

Posted 30 January 2013 - 05:10 PM

Great. You win.

But what I really meant was can you draw a magic 3x3 picture? ;)
  • 0
The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#18 CaptainEd

CaptainEd

    Senior Member

  • Members
  • PipPipPipPip
  • 1094 posts

Posted 30 January 2013 - 05:14 PM

Great. You win.

But what I really meant was can you draw a magic 3x3 picture? ;)

Oh, woops! Uh, no...especially on a day when I can't even code a spoiler :unsure:


  • 0

#19 bonanova

bonanova

    bonanova

  • Moderator
  • PipPipPipPip
  • 5840 posts
  • Gender:Male
  • Location:New York

Posted 30 January 2013 - 06:30 PM

8 1 6
3 5 7
4 9 2


Does that help?
  • 0
The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#20 CaptainEd

CaptainEd

    Senior Member

  • Members
  • PipPipPipPip
  • 1094 posts

Posted 30 January 2013 - 06:42 PM

:blush: Rather easy when you put it that way...


  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users